Biology Past Questions and Answers

a. State <b>three </b>features of the small intestine that increase the rate of absorption of digested food. [3 marks]<br/>b. Explain <b>briefly </b>what happens to the glucose formed in a plant during photosynthesis. [3 marks]<br/>c. Explain <b>briefly </b>the mode of feeding in each of the following organisms:<br/> (i) Euglena; [4 marks]<br/> (ii) Spirogyra. [4 marks]<br/>d. State <b>three</b> characteristics of an Estuarine habitat. [3 marks]<br/>e. State <b>three</b> differences between an aquatic habitat and a terrestrial habitat. [3 marks]

a. State <b>five </b>:<br/> (i) challenges that make conservation of resources difficult; [5 marks]<br/> (ii) ways by which the Government of a country ensures conservation of natural resources. [5 marks]<br/>b. What is an endangered species? [3 marks]<br/>c. A child with blood group O was born to a mother of blood group A.<br/> (i) What is the blood group genotype of the child? [1 marks]<br/> (ii) What are the possible blood group genotypes of the father? [3 marks]<br/>d. State <b>three </b>reasons why genetic variation is important to plants. [3 marks]

A homozygous tall, red flower plant was crossed with a homozygous dwarf, white flower plant. The F1 were selfed and 160 F2 plants were obtained.<br/> <br/> a.(i) Name the type of genetic cross. [1 marks]<br/> (ii) State <b>one </b>reason for the answer in 4(a)(i). [1 marks]<br/> b.(i) What is evolution? [2 marks]<br/> (ii) With the aid of a genetic diagram, state the phenotypic ratio of F2 generation. [13 marks]<br/> (iii) Calculate the number of tall and white flowers that would be obtained in the <b>F2 </b>generation. [3 marks]

a. (i) Complete the table below with the respiratory surface of <b>each </b>of the listed organisms.<br/> <br/><table class='tbn'><tbody><tr><td> organism </td><td> respiratory surface </td></tr><tr><td> Tadpole (2days old) </td><td> </td></tr><tr><td> Cockroach </td><td> </td></tr><tr><td> Domestic fowl </td><td> </td></tr><tr><td> Talinum </td><td> </td></tr><tr><td> Earth Worm </td><td> </td></tr><tr><td> Amoeba </td><td> </td></tr></tbody></table><br/><br/><br/> (ii) State <b>five </b>characteristic features of respiratory surfaces in organisms. [5 marks]<br/>b. Make a drawing, 4 cm – 6 cm long of the respiratory organ in Tilapia and label fully. [9 marks]<br/>

b. List <b>five </b>parts of the alimentary canal of an earthworm. [5 marks]<br/>c. State <b>six </b>ways by which water could be polluted by agricultural. [6 marks]<br/>d. Describe briefly the life cycle of a housefly. [5 marks]<br/>e. Make a diagram, 6 cm – 8 cm long of the hypogeal germination in a mature maize seedling and label fully. [8 marks]